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PowerPoint® Lecture Slide Presentation by Vince Austin
Human Anatomy & Physiology
FIFTH EDITION
Elaine N. Marieb
Chapter 10
The Muscular System
Part H
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Muscles Crossing Hip and Knee Joints
• Most anterior compartment muscles of the hip and
thigh flex the femur at the hip and extend the leg at
the knee
• Posterior compartment muscles of the hip and thigh
extend the thigh and flex the leg
• The medial compartment muscles all adduct the thigh
• These three groups are enclosed by the fascia lata
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Movements of the Thigh at the Hip:
Flexion and Extension
• The ball-and-socket hip joint permits flexion,
extension, abduction, adduction, circumduction, and
rotation
• The most important thigh flexors are the iliopsoas
(prime mover), tensor fasciae latae, and rectus
femoris
• The medially located adductor muscles and sartorius
assist in thigh flexion
• Thigh extension is primarily effected by the
hamstring muscles (biceps femoris, semitendinosus,
and semimembranosus)
• Forceful extension is aided by the gluteus maximus
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Movements of the Thigh at the Hip:
Flexion and Extension
Figure 10.19a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Movements of the Thigh at the Hip:
Flexion and Extension
Figure 10.20a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Movements of the Thigh at the Hip:
Other Movements
• Abduction and rotation are effected by the gluteus
medius and minimus, and are antagonized by the
lateral rotators
• Thigh adduction is the role of five adductor muscles
(adductor magnus, longus, and brevis; the pectineus,
and the gracilis)
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Movements of the Thigh at the Hip:
Other Movements
Figure 10.20a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Movements of the Thigh at the Hip:
Other Movements
Figure 10.20b
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Movements of the Knee Joint
• The sole extensor
of the knee is the
quadriceps
femoris
• The hamstring
muscles flex the
knee, and are
antagonists to the
quadriceps
femoris
Figure 10.19a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Fascia of the Leg
• A deep fascia of the leg is
continuous with the
fascia lata
• This fascia segregates the
leg into three
compartments: anterior,
lateral, and posterior
• Distally, the fascia
thickens and forms the
flexor, extensor, and
fibular retinaculae
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 10.22a
Muscles of the Leg: Movements
• Various leg muscles produce the following
movements at the:
• Ankle – dorsiflexion and plantar flexion
• Intertarsal joints – inversion and eversion of the foot
• Toes – flexion and extension
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Muscles of the Anterior Compartment
• These muscles are the
primary toe extensors and
ankle dorsiflexors
• They include the tibialis
anterior, extensor digitorum
longus, extensor hallucis
longus, and fibularis tertius
Figure 10.21a
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Muscles of the Anterior Compartment
Figure 10.21b-d
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings